Available in the United Kingdom

Best Slot Bonus Offers

There are many different bonuses online casinos have to offer, and one of the most sought-after is the one for slots. Free spins, bonus spins and other promotions allow you to play new and established online slots, either after making your first deposit or completely free of cost. On this page, we present you with a list of the best slots bonuses and explain what types are out there.

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Welcome bonus

100% up to £150

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Extras

150 Bonus Spins

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150 Bonus Spins

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  • 20
  • x35
  • 29/04/2023

Bonus info

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  • 20
  • x35
  • 29/04/2023

Terms and conditions apply. New players only. 18+. Minimum deposit £/€20. Maximum bonus $150. Wagering requirement 35x. Gambling can be addictive. Please play responsibly. | T&C | www.begambleaware.org

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Welcome bonus

500% up to £50

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-

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  • 10
  • x30
  • 16/03/2024

Bonus info

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  • 10
  • x30
  • 16/03/2024

18+. New customers only. First deposit of £10 required. Max £50 bonus. 30x wagering requirement. Max redeemable £1,000. Bonus expires 72 hours after issue. Eligibility rules, game, location, payment-restrictions, stake contributions and terms and conditions apply. | T&C | www.begambleaware.org

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Welcome bonus

50 Bonus Spins

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Extras

-

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  • 10
  • x0
  • 15/03/2024

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  • 10
  • x0
  • 15/03/2024

18+. New players from the UK only. Get 50 wager-free spins on Book of Dead™️ (£0.10, valid for 7 days) with your first deposit. Available once per customer. Opt-in by selecting the Welcome Offer tab before making your deposit, otherwise select "NO BONUS". Winnings from spins carry no wagering requirement. Maximum winnings are capped at £100. Irregular gameplay may affect eligibility. | T&C | www.begambleaware.org

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Welcome bonus

100% up to £123

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Extras

-

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  • 10
  • x50
  • 22/03/2023

Bonus info

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  • 10
  • x50
  • 22/03/2023

#AD New players only, Maximum bonus is £123, Max bet with bonus is £5, No max cash out, Wagering is 50x – Skrill & Neteller excluded, Eligibility is restricted for suspected abuse, Cashback is cash, so no wagering, Cashback applies to deposit where no bonus is included. Full T&C’s apply. | T&C | www.begambleaware.org

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bonus amount
Welcome bonus

100% up to £50

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Extras

50 Bonus Spins

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Extras

50 Bonus Spins

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  • 10
  • x30
  • 15/03/2024

Bonus info

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  • 10
  • x30
  • 15/03/2024

Automatically credited upon deposit. Cancellation can be requested. First Deposit Only. Max. Bonus £50. Maximum amount of Free Spins is 50. Book of Dead, Spin Value: £0.10. WR of 30x Deposit + Bonus amount and 60x Free Spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the free spin winnings and bonus amount or £5 (lowest amount applies). Spins must be used and/or Bonus must be claimed before using deposited funds. Deposit/Welcome Bonus can only be claimed once every 72 hours across all Casinos. | T&C | www.begambleaware.org

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bonus amount
Welcome bonus

100% up to £100

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Extras

-

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  • 10
  • x40
  • 26/02/2023

Bonus info

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  • 10
  • x40
  • 26/02/2023

#AD New customers only, min deposit £20, wagering 40x, max bet £5 with bonus funds. Max bonus is 100% up to £100. No max cash out on deposit offers. Welcome bonus excluded for players depositing with Skrill or Neteller. Cashback is cash with no restriction. Full T&C’s apply. | T&C | www.begambleaware.org

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Welcome bonus

up to 500 Spins

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-

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  • 10
  • x65
  • 16/02/2024

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  • 10
  • x65
  • 16/02/2024

Mega Reel bonus with up to 500 free spins on Fluffy Favourites. New players only, £10 min fund, £8 max win per 10 spins, max bonus conversion equal to lifetime deposits (up to £250) to real funds, 65x wagering requirements apply. | T&C | www.begambleaware.org

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bonus amount
Welcome bonus

100% up to £99

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Extras

99 Bonus Spins

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99 Bonus Spins

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  • 20
  • x40
  • 25/02/2023

Bonus info

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  • 20
  • x40
  • 25/02/2023

#AD New customers only, min deposit £20, wagering 40x, max bet £5 with bonus funds. 100% up to £99 bonus + 99 free spins on 1st deposit. No max cash out on deposit offers. Welcome bonus excluded for players depositing with Skrill or Neteller. | T&C | www.begambleaware.org

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bonus amount
Welcome bonus

100% up to £100

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Extras

-

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  • 10
  • x30
  • 17/02/2024

Bonus info

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  • 10
  • x30
  • 17/02/2024

Deposit Bonus Offer: £20 min deposit. 100% up to £100 Bonus. Bonus wins are capped at £500. To withdraw bonus & related wins, wager 30x (bonus amount) within 90 days. Restrictions apply to deposit until wagering requirement fulfilled. | T&C | www.begambleaware.org

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bonus amount
Welcome bonus

100% up to £200

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Extras

-

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  • 10
  • x50
  • 15/02/2024

Bonus info

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  • 10
  • x50
  • 15/02/2024

Deposit Bonus Offer: FreePlay (FP) wins credited as bonus & capped at amount received, exc. JP win • Valid for selected games • Bonus wins capped at £500, excl. JP wins • Pre-1st deposit only: Bonus wins & max redeemable amount capped at £100, excl. JP wins • 50x wagering - req. vary by game • Bonus expires in 90 days • Payment method & country restrictions apply • Withdrawal restrictions & T&Cs apply | T&C | www.begambleaware.org

Our casino guide for slots bonuses

The main feature that distinguishes casino offers designed for online slots is whether they require a deposit or not. The ones that do not are much more popular, understandably.

People love freebies.

But online casinos have much more to offer for fans of one-armed-bandits.

To find the best slots bonus, pay attention to the wagering requirements as they indicate how feasibly it is to play through the bonus. We will go into detail about them later on this page.

Of course, you want to play provably fair slots, which is why we only list licensed online casinos who have their games tested and accredited for fairness.

Without further ado, we will show you what type of slot bonuses you can find and which offer the best value.

Let’s go.

Match bonus

You get your first deposit matched by a certain percentage, up to a certain amount, through match bonuses.

You can also find welcome packages where your 1st, 2nd, 3rd and 4th deposit gets matched while additionally receiving free spins for slot games.

The bonus balance from match offers is playable on all slots, while the free spins are only valid on selected slots.

Quick facts

  • You can get your first deposit doubled, tripled or even quadrupled;
  • You can receive additional rewards like bonus spins or other free play credits;
  • You can use all of the game credits on all slots in most instances.

You can learn more about them by reading our guide to find the best match bonuses.

Bonus spins on first deposit

Some online casinos have their welcome offers fully tailored towards slots, solely offering you bonus spins for specific online slots but won’t match your first deposit. You will usually receive more credits than when you claim a match bonus.

The downside with claiming them is that you can use them only on the slot games specified by the operator. So you can’t pick any game you like, which is a big minus if you ask us.

They also generally have a low value of 10p each; so they are not really worth it in our opinion, unless you are looking for casino bonuses with no wagering requirements – those will always be bonus spins.

Other online casinos offer you a welcome package consisting of a match bonus and bonus spins altogether, so we advise comparing offers to find one of those as they have an increased value.

Quick facts

  • Bonus spins are only available on selected slot games as specified by the casino;
  • You can get bonus spins as part of a welcome package which includes a match bonus.

You can learn more about them by reading through our page, where we explain how to get the best free spins deposit bonuses.

Free spins, no deposit bonus

If you are looking for freebies, this slot bonus is your best bet. Many online casinos are generous enough to hand out free spins with no deposit requirement. That’s a campaign built in partnership with game makers who want to promote either new releases or their most popular titles.

The deal is a win-win for both the casino and players. You can play slots for free with no deposit needed, keep parts of your winnings and try out the casino without risks.

However, you will often have to do something to get them, like verifying your identity, phone number or credit card.

Quick facts

  • Free spins allow to play slot games and win real money with no deposit needed;
  • You will only be able to play the specific titles specified by the online casino;
  • You will be able to keep part of your winnings, but not all.

You can claim over 500 free spins through our page dedicated to slot sites with free sign up bonuses.

Mega reel slots bonus

That is a special offer commonly found at casinos powered by Jumpman Gaming. The Mega Reel is a wheel containing a handful of fields with each having a different prize.

You can spin the wheel on your first deposit or as part of being a member of a loyalty program.

The prizes include low-value goodies like an Amazon Voucher, while the fields you want to land on can 100x your deposit or reward 500 free spins.

Of course, the better prizes are less likely to be spun. The only way to increase your chances of winning them is by respinning, which requires you to make a new payment.

Quick facts

  • The Mega Reel is a wheel with several fields, each containing different prizes;
  • You can spin the wheel on each of your deposits or as part of a loyalty reward program;
  • The likelihood of winning each prize varies, with the higher ones being the most unlikely to be spun;
  • This bonus has, in most cases, very high wagering requirements of 65x your bonus;
  • You can use the free spins on specific online slot games only;

If you are curious about this deposit bonus, you can learn more by reading our guide to find the best Mega Reel sites.

How to spot the best casino bonus

Now that you know all about the different casino bonuses out there, you probably have a favourite already. But there are some other essential things to consider before making a choice.

Pay attention to the wagering requirements

On each of our listed slots bonuses, you will find the wagering requirement displayed. We advise paying attention to those numbers as they can significantly impact your experience using the bonus.

Online casinos impose wagering requirements so that players don’t immediately withdraw their bonus funds.

Makes sense.

Depending on the operator and region you are residing, there can be differences in how they do it:

  • Bonus funds always* have wagering requirements and the winnings will be pending until the conditions have been met;
  • Not all casino games contribute towards the wagering requirement with the same rate;
  • In online casinos not regulated by the UKGC, your deposit itself can be subject to wagering requirements too.

*There are also some online casinos that have zero wagering requirements across all their offers. Those are pretty popular as it’s a pretty nasty surprise for many new players to learn they can’t (yet) withdraw their winnings.

The United Kingdom Gambling Commission (UKGC) licenses all legal online casinos in the jurisdiction they govern. (1) They had the following to say regarding players’ deposits.

Players must be informed that they are allowed to withdraw their deposit balance at any time, including when a bonus is pending or active on the account. Players must be allowed to withdraw without restriction, except as necessary to comply with any General Regulatory Obligations.

If you try withdrawing any winnings before meeting the wagering conditions, your bonus funds might be forfeited.

Wagering contribution

What’s a big plus is that each bet on slot games fully contributes towards the wagering requirement, except in the rare instance where certain high RTP slots or other specific titles are excluded.

Betting on table games like roulette or blackjack only partially contributes towards the wagering requirement.

Use our filters and sorting options

We have pretty powerful filter and sorting options. You can look for all types of things through them.

  • Search for your favourites games and select multiple;
  • Search and select your preferred payment method;
  • Look for other options like betting, bingo or poker;
  • Search and select your favourite software providers.

You can select multiple options to find the perfect online casino with the options you’d like it to have. That comes in pretty handy if you only have one valid payment method at hand, or got some favourite games you want the online casino to have.

Other considerations you should make

Online casinos are infamous for attaching an abundance of conditions to their offers. We will give a brief introduction to them below.

  • Bet limits: You can’t exceed the maximum bet limit the online casino specifies while playing through the bonus.
  • Maximum win policies: The winnings accrued from playing with bonus money are often subject to maximum win limits, especially when playing with free spins.
  • Payment method restrictions: You often can’t use E-wallets like Skrill or Neteller to unlock the slot bonus as those are excluded from many paid casino promotions.
  • Country restrictions: Bonus offers vary based on the region due to legal reasons and are not available from all countries.

Aside from that, you should read reviews about the online casinos you consider joining.

At Gamblee, we only list licensed slot sites so you don’t have to worry regarding safety, but there is still a big difference in quality between them, so comparing pays off.

Tip: Read the conditions attached to the offer before claiming your slot bonus.